const http = require('http');
http.createServer(function(request,response){
    //发送HTTP头部
    //HTTP 状态值: 200 :ok
    //内容类型: text/plain
    response.writeHead(200,{'Content-Type':'text/plain'});

    //发送响应数据 "Hello World"
    response.end('Hello Server');
}).listen(8888);

//终端打印如下信息
console.log('Server running at http://127.0.0.1:8888/');